mysql怎么依据date做年，月，日分组统计查询

使用 YEAR(), MONTH(), DAY() 来猎取年月日

SELECT YEAR(application_date) as years, count(1) FROM patent GROUP BY YEAR(application_date) ORDER BY years
-- YEAR(application_date)   猎取年份
-- MONTH(application_date)　猎取月份
-- DAY(application_date)    猎取日

使用 date_format(application_date, '%Y')，可自定义日期格局

SELECT date_format(application_date, "%Y") as year, count(1) FROM patent GROUP BY date_format(application_date, "%Y")

引荐：《mysql教程》

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